UEFN crashes immediately after launching it after v40.00 update

General Issues and Bug Reporting
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1

Summary

Can’t launch UEFN after the v40.00 game update, it just crashes every time. Completely reinstalled Fortnite + UEFN, rechecked files, updated drivers, the issue still persist

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Stability

Steps to Reproduce

Launch UEFN via Epic Games Launcher

Expected Result

UEFN starting

Observed Result

UEFN is crashing

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x000000000003932c

UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
kernel32
ntdll

Platform(s)

PC

Upload an image

изображение_2026-03-20_155243343.png
изображение_2026-03-20_155243343.png764×618 69.6 KB

2

UECC-Windows-569A4616496FC42DF703C8A6386EB154_0000.rar (433.0 KB)
Here is the editor logs from \AppData\Local\UnrealEditorFortnite\Saved\Crashes

4

The status of FORT-1078054 changed to ‘Needs Triage’. We’ve confirmed the issue and it’s waiting to be assigned to someone to fix it.